您现在的位置:首页>外文期刊>American Water Works Association Journal

期刊信息

  • 期刊名称:

    American Water Works Association Journal

  • 中文名称: 美国水务协会杂志
  • 刊频:
  • ISSN: 0003-150X
  • 出版社: -
  • 简介:
  • 排序:
  • 显示:
  • 每页:
全选(0
<1/20>
617条结果
  • 机译 使用消毒残留剂的好处
    • 作者:Charles N. Haas;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Water distribution systems in the United States routinely carry chlorine residuals < 0.05 mg/L and invariably carry residuals > 0.1 mg/L. This article outlines some of the benefits of using chlorine as a disinfectant residual and considers system characteristics (e.g., system age and vulnerability) that support this application. Benefits accruing to maintenance of a chlorine residual include protecting against modest degrees of intrusion of contaminants, serving as a sentinel for the presence of such contamination, and reducing the potential for growth of heterotrophic organisms.
  • 机译 叉在路上
    • 作者:Jack W. Hoffbuhr;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Yogi Berra, that wonderful phraseologist, once said, "When you come to a fork in the road, take it." Sounds like good advice to me, particularly as we approach the year 2000. In addition to the much-heralded computer problems, the new millennium is also shaping up to be a harbinger of dramatic changes in the drinking water profession. What kind of environment will we be operating in, and where will the forks in the road lead?
  • 机译 读者转向执行摘要
    • 作者:Nancy M. Zeilig;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:A magazine you read every month is like an old friend you often meet for lunch. With a friend, you drift into certain behavior patterns without consciously thinking about them. With a magazine, you automatically turn to the sections you've learned to rely on, taking for granted they'll always be there.
  • 机译 加强消毒剂残留的氯化处理
    摘要:Booster chlorination is an approach to residual maintenance in which chlorine is applied at strategic locations within the distribution system. Situations in which booster chlorination may be most effective for maintaining a residual are explained informally in the context of a conceptual distribution system. To form the basis of a quantitative analysis of booster chlorination, experiments simulated chlorine decay under booster conditions. These experiments suggested a conceptual model for bulk chlorine decay, which is used to analyze an example representing a header pipe serving two distinct zones in a distribution system. The chlorine mass savings associated with booster chlorination in this example are derived and used to show the influence of flow rates, residence times, and decay kinetics on the effectiveness of booster chlorination. The role of booster chlorination is also discussed as part of coordinated treatment efforts meant to manage the risks associated with biological regrowth and disinfection by-products.
  • 机译 消毒剂残留难题
    • 作者:;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:European and American experts agree that more research is needed to understand how maintaining a residual affects public health, biological stability, treatment practices, and, ultimately, the consumer.
  • 机译 维护配电系统的完整性
    • 作者:R. Rhodes Trussell;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:When water utilities began using chlorine for primary disinfection, a residual in the distribution system came with it. Regulations have made the distribution system residual an increasingly important requirement in many parts of the world. However, many groundwater systems commonly operate without a residual, and several European utilities now operate with no residual in treated surface water. This article examines the reasons often cited for maintaining a disinfectant residual and discusses the merits of alternative residual disinfectants.
  • 机译 保持消毒剂残留的情况
    摘要:Maintenance of a disinfectant residual in drinking water systems has been the cornerstone of sanitary engineering for nearly a century. The author argues that eliminating the disinfectant residual in North American systems is ill advised until issues related to controlling bacterial regrowth and distribution system contamination are better understood. In the meantime, the water supply industry should direct its efforts toward making disinfection practices compatible with other water quality and aesthetic goals.
  • 机译 会议:不值钱还是值钱?
    • 作者:Ellen G. Miller;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Few topics divide small system boards or councils faster than state or national conferences. Some think that only the operator should attend; others want all employees to attend. A handful even urge their board or council members to go. Why the debate? Two reasons stand out-possible criticism for misuse of public funds and belief that attendees won't learn anything. Both opinions are reasonable.
  • 机译 保持质量,无残留消毒剂
    摘要:Preservation of the microbial quality of drinking water during distribution is a main objective in water supply. Although a disinfectant residual reduces the concentration of suspended bacteria, it has only a limited effect on microorganisms in biofilms and sediments or on microbial contaminants. Furthermore, a disinfectant residual affects taste and odor and results in the presence of compounds with toxic properties. Maintenance of an effective residual throughout the distribution system is hampered by disinfectant decay caused by pipe materials and compounds present in the water. The Netherlands depends on good engineering practices in the distribution system to prevent microbial and chemical contamination. Regrowth can be limited by distributing biostable drinking water and applying biostable materials in contact with drinking water.
  • 机译 欧洲残留消毒法规
    • 作者:OWN HYDES;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:This article describes the relevant requrements of the European Community Drinking Water Directive and outlines how the European Union's 15 member states and Switzerland have implemented them. European countries vary considerably in their national requirements or guidance on disinfection and the use of disinfectant residuals within the distribution system. Although a few European countries require all water supplies to be disinfected and a disinfectant residual to be maintained, some countries do not require disinfection or the use of a disinfectant residual. Some countries adopt intermediate positions, and many countries have exceeded the directive's requirements. A number of factors influence countries' practives, including the nature and quality of their water sources, meteorological conditions, the degree of treatment provided to remove impurities, concern about disinfection by-products, and the operation and condition of hte distribution system. A recently agreed on new Drinking Water Directive is also described.
  • 机译 保障配电系统的完整性
    • 作者:R.RHODES TRUSSELL;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:When water utilities began using chlorine for primary disinfection, a residual in the distribution system came with it. Regulations have made the distribution system residual an increasingly important requirement in many parts ofthe world However, many ground water systems commonly operate without a residulal, and several European utilities now operate with no residual in treated surface water. This article examines the reasons often cited for maintaining a disinfectant residual and discusses the merits of alternative residual disinfectants.
  • 机译 分配不含消毒剂残留的地下水
    • 作者:Beate Hambsch;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Microbiological data on drinking water in a distribution system were compared before and after the treatment plant discontinued use of a chlorine residual. Bacteriological assessments of chlorinated groundwater consistently showed heterotrophic plate counts (HPCs) < 5 colony forming units (cfu)/mL, a count indicating that bacterial regrowth was very unlikely. Because chlorination that produced about 0.1 mg/L free chlorine residual led to taste and odor complaints, chlorination was discontinued, and water that contained no residual was distributed. Shortly after this change, samples with higher retention times produced HPCs as high as 60-80 cfu/mL. After four to six weeks these counts decreased to values again < 5 cfu/mL. This short-term increase in HPCs, which has also been observed in other cases, is assumed to be due to a change in the biofilm.
  • 机译 符合SDWA法规的联邦设施
    摘要:Section 1447 of the Safe Drinking Water Act (SDWA), initially enacted in 1974, requires federal facilities to comply with SDWA regulations. This section was substantially revised by the 1996 SDWA amendments. The US Environmental Protection Agency's (USEPA's) Federal Facility Enforcement Office (FFEO) is responsible for ensuring that federal facilities take all necessary actions to comply with environmental regulations, including those promulgated by USEPA under the SDWA.
  • 机译 欧洲残留消毒法规
    • 作者:Owen Hydes;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:This article describes the relevant requirements of the European Community Drinking Water Directive and outlines how the European Union's 15 member states and Switzerland have implemented them. European countries vary considerably in their national requirements or guidance on disinfection and the use of disinfectant residuals within the distribution system. Although a few European countries require all water supplies to be disinfected and a disinfectant residual to be maintained, some countries do not require disinfection or the use of a disinfectant residual. Some countries adopt intermediate positions, and many countries have exceeded the directive's requirements. A number of factors influence countries' practices, including the nature and quality of their water sources, meteorological conditions, the degree of treatment provided to remove impurities, concern about disinfection by-products, and the operation and condition of the distribution system. A recently agreed on new Drinking Water Directive is also described.
  • 机译 工程,施工技术活动重点
    • 作者:;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Under the theme of "Building the Twenty-first Century Water Works: Are You Prepared?" the 1999 Engineering and Construction Conference offers something for everyone. To be held at the Orlando Hyatt in Orlando, Fla., March 14-17, the conference quickly sets the tone with its opening general session on Monday. Two keynote speakers-Jack Hoffbuhr, AWWA executive director, and Bevin Beaudet, AWWA immediate past president-share their views on where the profession has been and where it is going.
  • 机译 美国残留消毒法规
    摘要:Most community water systems in the United States disinfect their water. However, only surface water systems are currently required to provide a disinfectant residual in the distribution system. This article reviews existing regulations, including the Surface Water Treatment Rule and the Total Coliform Rule, for maintaining a disinfectant residual and outlines their requirements. It also discusses forthcoming and long-term regulations and how they may affect water treatment and distribution system water quality, operations, and maintenance.
  • 机译 消毒还是不消毒
    • 作者:;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:To disinfect or not to dis-infect-that is the question with regard to maintaining disinfectant residuals in water distribution systems. The answer depends on whether the distribution system is in the United States, where most drinking water supplies add a disinfectant residual, or in Europe, where many systems don't. This month's theme articles tell both sides of the story.
  • 机译 使用消毒残留物的好处
    • 作者:CHARLES N.HAAS;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Water distribution systems in the United states routinely carry cholorine residuals<0.05 mg/L and invariably carry residuals>0.1 mg/L.This article outlines some of the benefits of using chlorine as a disinfectant residual and considers system characteristics (e.g.,system age and vulnerabiltiy)that support this application. Benefits accruing to maintenance of a chlorine residual include protecting against modest degrees of intrusion of contaminants, serving as a sentinel for the presence of such contamination,and reducing hte potential for growth of heterotrophic organisms.
  • 机译 分配地下水而无消毒残留
    • 作者:BEATE HAMBSCH;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Microbiological data on drinking water in a distribution system were compared before and after the treatment plant discontinued use of a chlorine residual. Bacteriological assessments of chlorinated groundwater consistently showed heterotrophic plate counts (HPCs)<5 colony forming units (cfu)/mL, a count indicating that bacterial regrowth was very unlikely. Because chlorination that produced about 0.1 mg/L free chlorine residual led to taste and odor complaints, chlorination was discontinued, and water that contained no residual was distributed. Shortly after this change, samples with higher retention times produced HPCs as high as 60-80 cfu/mL. After four to six weeks these counts decreased ot values again <5 cfu/mL. This short-term increase in HPCs, which has also been observed in other cases,is assumed to be due to a change in the biofilm.
  • 机译 加强消毒残留量的氯化处理
    • 作者:MICHAEL E.TRYBY;
    • 刊名:American Water Works Association Journal
    • 1999年第1期
    摘要:Booster chlorinaton is an approach to residual maintenance in which chlorine is applied at strategic locations within the distribution system. Situations in which booster chlorination may be most effective for maintaining a residual are explained informally in the context of a conceptual distribution system. To form the basis of a quantitative analysis of booster chlorination , experiments simulated chlorine decay under booster conditions. These experiments suggested a conceptual model for bulk chlorine decay, which is used to analyze an example representing a header pipe serving two distinct zones in a distribution system. The chlorine mass savings associated with booster chlorination in this example are derived and used to show the influence of flow rates, residence times, and decay kinetics on he effectiveness of booster chlorination. The role of booster chlorination is also discussed as part of coordinated treatment efforts meant to manage the risks associated with biological regrowth and disinfection by-products.
  • 联系方式:010-58892860转803 (工作时间) 18141920177 (微信同号)
  • 客服邮箱:kefu@zhangqiaokeyan.com
  • 京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-1 六维联合信息科技(北京)有限公司©版权所有
  • 客服微信
  • 服务号